Pregnancy is a complex physiological process during which a woman’s body undergoes tremendous changes to accept and nurture a new life. While this process progresses well for most women, the presence of underlying medical conditions, especially autoimmune disorders, can pose significant challenges. Autoimmune disorders occur when the body’s immune system, which is responsible for defending against pathogens, mistakenly attacks its own cells and tissues. These conditions can affect nearly every organ and system in the body and have a complex interaction with pregnancy.
The influence of these diseases on pregnancy is two-fold: on one hand, the autoimmune disease itself and its severity can impact pregnancy outcomes, and on the other hand, pregnancy can affect the activity of the autoimmune disease.
Mechanisms of Influence
Several key mechanisms explain how autoimmune disorders affect pregnancy. The most important of these mechanisms are chronic inflammation, the production of autoantibodies, and changes in the immune system during pregnancy.
Normally, the body’s immune system during pregnancy shifts from a cell-mediated immune response (Th1) toward a humoral immune response (Th2) to prevent the rejection of the fetus, which inherits half of its genes from the father. These hormonal and immunological changes can influence the activity of an autoimmune disease. For example, some diseases like rheumatoid arthritis often improve during pregnancy, while others like systemic lupus erythematosus (SLE) can flare up.
Autoantibodies play a significant role in causing harm to the fetus and the placenta. For example, in antiphospholipid syndrome (APS), the antibodies attack phospholipids on cell membranes, leading to blood clots in the placental vessels. These clots disrupt blood flow to the fetus, significantly increasing the risk of recurrent miscarriage, stillbirth, severe preeclampsia, and intrauterine growth restriction (IUGR). Other antibodies, such as anti-SSA/Ro and anti-SSB/La antibodies found in lupus and Sjögren’s syndrome, can cross the placenta and cause congenital heart block in the fetus.
Systemic and chronic inflammation resulting from autoimmune diseases can also affect placental health, leading to placental insufficiency. This can disrupt fetal growth and increase the risk of preterm birth.
Systemic Lupus Erythematosus (SLE)
Lupus is one of the most common and complex autoimmune diseases in women of childbearing age. Pregnancy can cause lupus to flare up, especially if the disease is active at the time of conception. A lupus flare can damage the kidneys, lungs, and nervous system. On the other hand, high disease activity at the time of conception significantly increases the risk of pregnancy complications. These complications include preeclampsia, intrauterine growth restriction, and preterm birth. For this reason, it is recommended that women with lupus only attempt to conceive when their disease has been in remission for at least 6 months.
Rheumatoid Arthritis (RA)
Unlike lupus, rheumatoid arthritis improves in about 70% of cases during pregnancy. This is due to hormonal and immunological changes. However, a relapse of symptoms is very common after childbirth. If the disease is active at the time of conception, it can lead to infants with low birth weight. Managing this disease during pregnancy involves choosing medications that are safe for the fetus.
Antiphospholipid Syndrome (APS)
Antiphospholipid syndrome is one of the most important causes of recurrent miscarriage and severe pregnancy complications. The antiphospholipid antibodies cause clots to form in the placental vessels. The standard treatment for this disease during pregnancy is a combination of low-molecular-weight heparin (LMWH) and low-dose aspirin, significantly improving pregnancy outcomes. Without treatment, the risk of miscarriage or stillbirth is extremely high.
Inflammatory Bowel Disease (IBD)
Diseases like Crohn’s and ulcerative colitis can affect pregnancy. If the disease is in remission, pregnancy usually proceeds well. However, a flare-up during pregnancy can increase the risk of preterm birth, intrauterine growth restriction, and low birth weight. Choosing medications that are safe during pregnancy is crucial for managing the disease.
Autoimmune Thyroiditis (Hashimoto’s)
This disease, which causes hypothyroidism, can lead to miscarriage, preeclampsia, and cognitive impairments in the fetus if left untreated. Close monitoring of thyroid hormone levels with levothyroxine during pregnancy is essential.
Pre-pregnancy Management and Care
Pre-pregnancy planning is crucial for women with autoimmune diseases. This involves several key steps:
- Assessing Disease Activity: Ensuring the disease is in remission or has minimal activity. This helps to minimize risks for both the mother and the fetus.
- Medication Review: Many medications used to treat autoimmune diseases, such as methotrexate, cyclophosphamide, and mycophenolate mofetil, are teratogenic (harmful to the fetus) and must be discontinued or replaced with safer alternatives before conception.
- Organ Health Assessment: Evaluating the function of the kidneys, liver, and cardiovascular system to ensure the mother’s body is ready to handle the demands of pregnancy.
- Consulting the Medical Team: Working closely with a rheumatologist, obstetrician, and other specialists to create a comprehensive care plan.
Pregnancy Care
Pregnancy care for these women should be multidisciplinary and supervised by a specialized team. Close and regular monitoring includes the following:
- Monitoring Disease Activity: Performing blood and urine tests to check for inflammatory markers and disease activity.
- Frequent Ultrasounds: To assess fetal growth and placental health.
- Preeclampsia Screening: Due to the increased risk of preeclampsia, blood pressure and protein in the urine are regularly monitored.
- Fetal Health Monitoring: In diseases like lupus and Sjögren’s syndrome, fetal heart ultrasounds are essential to check for congenital heart block.
Childbirth and Postpartum
The timing and method of childbirth should be determined by considering the health of both the mother and the fetus. In some cases, labor induction or a cesarean section may be necessary due to pregnancy complications. Postpartum care is just as important, as many autoimmune diseases relapse after childbirth, and medication adjustments are often needed. Furthermore, the decision regarding breastfeeding should be made based on the types of medications and their potential effects on the baby.
Challenges and Outcomes
Despite scientific advancements, pregnancy in women with autoimmune diseases still presents numerous challenges. These challenges include:
- Delayed Diagnosis: Some symptoms of autoimmune diseases (such as fatigue and joint pain) overlap with natural symptoms of pregnancy, making it difficult to diagnose a disease flare-up.
- Fear of Medications: Many women avoid taking their medications due to concerns about their effects on the fetus, which can lead to more severe complications.
- Insufficient Knowledge: Many general practitioners and even gynecologists may not have sufficient knowledge about the complex management of these conditions.
However, pregnancy outcomes for women with autoimmune diseases are increasingly improving. This improvement is due to careful planning before pregnancy, comprehensive management during pregnancy, and close monitoring postpartum. Today, with the collaboration of specialized medical teams, most women with autoimmune diseases can have successful pregnancies and healthy babies. The key to success on this journey is awareness, collaboration, and diligent medical follow-up.
The bottom line
Pregnancy in women with autoimmune diseases is a complex and challenging process that requires a multidisciplinary and comprehensive approach. The effects of these diseases on pregnancy can range from recurrent miscarriages and severe placental complications to fetal growth restriction and preterm birth. However, with proper planning, careful medication management, and continuous monitoring, risks can be minimized, and pregnancy outcomes can be significantly improved.
A mother’s awareness, close collaboration with her medical team, and full adherence to instructions are key factors for achieving a successful and safe pregnancy. The future care for these women is bright, and research into the precise mechanisms of the interaction between immunity and pregnancy promises more effective treatments in the future.
Additional questions
- What specific hormones are responsible for the immune system shift from a Th1 to a Th2 response during pregnancy?
Progesterone, human chorionic gonadotropin (hCG), and estrogen are key hormones that manage the immune response shift from Th1 (a pro-inflammatory and cellular response) to Th2 (a more tolerant and humoral response) during pregnancy. This change is essential to prevent the mother’s immune system from attacking the fetus, which is recognized as a semi-foreign graft.
- Can a woman with an autoimmune disease successfully breastfeed her baby?
A woman with an autoimmune disease can often breastfeed successfully, but the primary factor is her medication. Many medications, including common biologics, are safe because they don’t pass into breast milk in significant amounts. However, some drugs like methotrexate are contraindicated. Always consult with your medical team to weigh the specific medication’s risks against the breastfeeding benefits.
- How can stress affect the activity of autoimmune diseases during pregnancy?
Stress can disrupt the immune system by stimulating the release of stress hormones like cortisol and adrenaline. In people with autoimmune diseases, chronic stress can lead to increased inflammation and disease activity. This can result in a flare-up of disease symptoms and an increased risk of pregnancy complications, such as preterm birth. Therefore, stress management during pregnancy is crucial for women with these conditions.
- Do men with autoimmune diseases also need to take precautions before attempting to conceive?
Yes. Although the main focus is on the mother’s health, some medications used to treat autoimmune diseases in men, such as methotrexate, can affect sperm production or its genetic quality.
- What is the role of a nutritionist in managing pregnancy for women with autoimmune diseases?
A nutritionist is important because chronic inflammation from autoimmune diseases can cause nutrient malabsorption. A balanced diet rich in anti-inflammatory foods (like omega-3s) and essential vitamins can help reduce inflammation. For conditions like IBD, a proper diet is crucial for managing symptoms and preventing flare-ups.
References
https://www.autoimmuneinstitute.org/articles/pregnancy-with-an-autoimmune-disease/
https://www.draliabadi.com/obstetrics/high-risk-obstetrics/autoimmune-disorders/